Medicinal Use: The herb has proven to work faster than Proscor, a drug prescribed for an enlarged prostate. New theories hold that the herb may inhibit the action of an important hormone-regulating enzyme that converts testosterone into dihydrotesto- ster one, a process believed to be important in the development of both an enlarg- ed pr ostate and prostate cancer. Preventing this conversion is also the way finasteride works, which is the standard medication. Furthermore, it does not impair sexual function as does finasteride.